I think it's largely about the mindset that people have when going on holiday. Like Brits in Amsterdam, in the initial example, they're often there to get fucked up, which makes them bad even by tourist standards. Finns visiting Estonia have a similar reputation because booze prices are ridiculously expensive in Finland, so it's not uncommon for there to be a mini booze cruise over to Estonia and back, sometimes literally just to purchase the alcohol, and sometimes to get drunk and also bring some booze back.

Finland drinking culture reminded me of the UK actually in a few ways, in the prevalence of binge drinking specifically. Finns on average are less bad than Brits for this, but it's the mentality of the binge that's bad.